voL. 11.] Natural History of the Farallones. I51 
ZOOLOGY. 
The birds of the Farallon Islands have been collected and recorded 
until they are tolerably well known; but, so far as I am aware, no. 
attempt has hitherto been made to collect representatives of all the 
forms of life resident upon this little group of rocks. The trip made 
by Mr. J. W. Blankinship and myself, on July 3, 1892, was limited 
by the necessities of the case to a stay of only two whole days upon 
South Farallon Island, but we availed ourselves of the opportunity 
to collect in all departments of natural history to the fullest extent 
possible. In so brief a stay it was manifestly impossible to do more 
than skim over the surface in most branches, but the lists, even in 
their incomplete form, may be of value in showing the character of 
the life of the spot. Larger collections might have been made of 
certain classes had not Mr. Blankinship devoted a large part of his 
time to the study of the geology and botany of the island, while I 
was engaged in observing the habits of the birds and in making 
collections of the young for future investigation. 
The results of the survey were disappointing in one respect, viz.: 
that no evidence was obtained indicating that any of the animals of 
the islands have become differentiated from mainland forms. It may 
be that fuller collections, or more careful elaboration of the material 
obtained, would show some slight variations, although, if present at 
all, they are undoubtedly very incipient in nature. It would seem 
as if the wingless beetles and the one batrachian of the islands would 
be effectually isolated upon a bare rock thirty miles from the main- 
land, but it is impossible to say that these forms have not been ac- 
cidentally introduced in recent times through the agency of man. 
Unfortunately, we have been unable to have some few of the spiders, 
insects, etc., identified, so these forms are necessarily omitted from 
the list. 
Mr. Wm. E. Ritter named the two following radiates: 
Asterias ochracea. 
Strongylocentrolus purpuratus. 
MOLLUSCA. ‘ 
The following list of the mollusca thus far recorded from the Far- 
allones has been kindly compiled by Dr. J. G. Cooper, from his 
published and unpublished lists, together with the collection of the 
expedition: 
